Fix startup_tests failure.  I added a new test but sometimes on a slow bot we don't get a new tab load (see valleys here: http://build.chromium.org/buildbot/perf/xp-release-single-core/new-tab-ui-cold/report.html?history=300 ).  Paper over these errors.
Fix startup_tests failure.  I added a new test but sometimes on a slow bot
we don't get a new tab load (see valleys here:
http://build.chromium.org/buildbot/perf/xp-release-single-core/new-tab-ui-cold/report.html?history=300
).  Paper over these errors.

TBR=evanm

Review URL: http://codereview.chromium.org/264003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@28313 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser